电商平台适用基础快递查询api接口对接demo解决方案

Posted 2020-11-15 kdn2019

电商企业从接收订单-配货-打印快递单到后期的快递员收件-快递配送-轨迹查询-签收短信通知等，都需要快递接口的接入。整理目前可以实现如上服务的有

1.各家快递公司：提供快递查询、电子面单打印等
2.快递100：提供在线寄件、快递查询等
3.菜鸟：提供快递查询、电子面单打印等
4.快递鸟：提供预约寄件、快递查询、电子面单打印、代收货款、短信服务等

各家快递公司提供的是一级接口，快递100、菜鸟和快递鸟是集成接口，对于使用快递比较多的企业来说，集成接口相对更好维护一些。所以一般电商都会选择集成的接口。
快递鸟是专做快递api接口服务的，接口类型也比较全一些，以下以快递鸟接口对接为例（提供的接口demo均为JAVA，如有其它语言demo需要请自行到官网下载）

对接流程：进入快递鸟官网申请接口——对接——联调测试——上线

预约取件-在线预约寄件

import java.io.BufferedReader;
import java.io.IOException; 
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
import java.security.MessageDigest; 
 
public class KdGoldAPIDemo {
 
    //电商ID
    private String EBusinessID="申请";    
    //电商加密私钥，注意保管，不要泄漏
    private String AppKey="申请"; 
    //测试请求url
    private string ReqURL = "http://testapi.kdniao.cc:8081/api/oorderservice"
    //正式请求url
    //private string ReqURL = "http://api.kdniao.cc/api/OOrderService";
 
    /**
     * Json方式 在线下单
     * @throws Exception 
     */
    public String orderOnlineByJson() throws Exception{
        String requestData= "{‘OrderCode‘: ‘012657700312‘," +
                                  "‘ShipperCode‘:‘YTO‘," +
                                  "‘PayType‘:1," +
                                  "‘ExpType‘:1," +
                                  "‘Cost‘:1.0," +
                                  "‘OtherCost‘:1.0," +
                                  "‘Sender‘:" +
                                  "{" +
                                  "‘Company‘:‘LV‘,‘Name‘:‘Taylor‘,‘Mobile‘:‘15018442396‘,‘ProvinceName‘:‘上海‘,‘CityName‘:‘上海‘,‘ExpAreaName‘:‘青浦区‘,‘Address‘:‘明珠路73号‘}," +
                                  "‘Receiver‘:" +
                                  "{" +
                                  "‘Company‘:‘GCCUI‘,‘Name‘:‘Yann‘,‘Mobile‘:‘15018442396‘,‘ProvinceName‘:‘北京‘,‘CityName‘:‘北京‘,‘ExpAreaName‘:‘朝阳区‘,‘Address‘:‘三里屯街道雅秀大厦‘}," +
                                  "‘Commodity‘:" +
                                  "[{" +
                                  "‘GoodsName‘:‘鞋子‘,‘Goodsquantity‘:1,‘GoodsWeight‘:1.0}]," +
                                  "‘AddService‘:" +
                                  "[{" +
                                  "‘Name‘:‘COD‘,‘Value‘:‘1020‘}]," +
                                  "‘Weight‘:1.0," +
                                  "‘Quantity‘:1," +
                                  "‘Volume‘:0.0," +
                                  "‘Remark‘:‘小心轻放‘," +
                                  "‘Commodity‘:" +
                                  "[{" +
                                  "‘GoodsName‘:‘鞋子‘," +
                                  "‘Goodsquantity‘:1," +
                                  "‘GoodsWeight‘:1.0}]" +
                                  "}";
 
        Map<String, String> params = new HashMap<String, String>();
        params.put("RequestData", urlEncoder(requestData, "UTF-8"));
        params.put("EBusinessID", EBusinessID);
        params.put("RequestType", "1001");
        String dataSign=encrypt(requestData, AppKey, "UTF-8");
        params.put("DataSign", urlEncoder(dataSign, "UTF-8"));
        params.put("DataType", "2");
 
        String result=sendPost(ReqURL, params); 
 
        //根据公司业务处理返回的信息......
 
        return result;
    }
 
    /**
     * MD5加密
     * @param str 内容       
     * @param charset 编码方式
     * @throws Exception 
     */
    @SuppressWarnings("unused")
    private String MD5(String str, String charset) throws Exception {
        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(str.getBytes(charset));
        byte[] result = md.digest();
        StringBuffer sb = new StringBuffer(32);
        for (int i = 0; i < result.length; i++) {
            int val = result[i] & 0xff;
            if (val <= 0xf) {
                sb.append("0");
            }
            sb.append(Integer.toHexString(val));
        }
        return sb.toString().toLowerCase();
    }
 
    /**
     * base64编码
     * @param str 内容       
     * @param charset 编码方式
     * @throws UnsupportedEncodingException 
     */
    private String base64(String str, String charset) throws UnsupportedEncodingException{
        String encoded = Base64.encode(str.getBytes(charset));
        return encoded;    
    }   
 
    @SuppressWarnings("unused")
    private String urlEncoder(String str, String charset) throws UnsupportedEncodingException{
        String result = URLEncoder.encode(str, charset);
        return result;
    }
 
    /**
     * 电商Sign签名生成
     * @param content 内容   
     * @param keyValue Appkey  
     * @param charset 编码方式
     * @throws UnsupportedEncodingException ,Exception
     * @return DataSign签名
     */
    @SuppressWarnings("unused")
    private String encrypt (String content, String keyValue, String charset) throws UnsupportedEncodingException, Exception
    {
        if (keyValue != null)
        {
            return base64(MD5(content + keyValue, charset), charset);
        }
        return base64(MD5(content, charset), charset);
    }
 
     /**
     * 向指定 URL 发送POST方法的请求     
     * @param url 发送请求的 URL    
     * @param params 请求的参数集合     
     * @return 远程资源的响应结果
     */
    @SuppressWarnings("unused")
    private String sendPost(String url, Map<String, String> params) {
        OutputStreamWriter out = null;
        BufferedReader in = null;        
        StringBuilder result = new StringBuilder(); 
        try {
            URL realUrl = new URL(url);
            HttpURLConnection conn =(HttpURLConnection) realUrl.openConnection();
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // POST方法
            conn.setRequestMethod("POST");
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            conn.connect();
            // 获取URLConnection对象对应的输出流
            out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
            // 发送请求参数            
            if (params != null) {
                  StringBuilder param = new StringBuilder(); 
                  for (Map.Entry<String, String> entry : params.entrySet()) {
                      if(param.length()>0){
                          param.append("&");
                      }               
                      param.append(entry.getKey());
                      param.append("=");
                      param.append(entry.getValue());                     
                      System.out.println(entry.getKey()+":"+entry.getValue());
                  }
                  System.out.println("param:"+param.toString());
                  out.write(param.toString());
            }
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream(), "UTF-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
        } catch (Exception e) {            
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result.toString();
    }
}

电子面单打印（可在官网下载批量打印demo）

import java.io.BufferedReader;
import java.io.IOException; 
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
import java.security.MessageDigest; 
 
public class KdGoldAPIDemo {
 
    //电商ID
    private String EBusinessID="申请";    
    //电商加密私钥，注意保管，不要泄漏
    private String AppKey="申请"; 
    //请求url, 正式环境地址：http://api.kdniao.cc/api/Eorderservice    测试环境地址：http://testapi.kdniao.cc:8081/api/EOrderService
    private String ReqURL="http://testapi.kdniao.cc:8081/api/Eorderservice";    
 
    /**
     * Json方式 电子面单
     * @throws Exception 
     */
    public String orderOnlineByJson() throws Exception{
        String requestData= "{‘OrderCode‘: ‘012657700387‘," +
                "‘ShipperCode‘:‘SF‘," +
                "‘PayType‘:1," +
                "‘ExpType‘:1," +
                "‘Cost‘:1.0," +
                "‘OtherCost‘:1.0," +
                "‘Sender‘:" +
                "{" +
                "‘Company‘:‘LV‘,‘Name‘:‘Taylor‘,‘Mobile‘:‘15018442396‘,‘ProvinceName‘:‘上海‘,‘CityName‘:‘上海‘,‘ExpAreaName‘:‘青浦区‘,‘Address‘:‘明珠路73号‘}," +
                "‘Receiver‘:" +
                "{" +
                "‘Company‘:‘GCCUI‘,‘Name‘:‘Yann‘,‘Mobile‘:‘15018442396‘,‘ProvinceName‘:‘北京‘,‘CityName‘:‘北京‘,‘ExpAreaName‘:‘朝阳区‘,‘Address‘:‘三里屯街道雅秀大厦‘}," +
                "‘Commodity‘:" +
                "[{" +
                "‘GoodsName‘:‘鞋子‘,‘Goodsquantity‘:1,‘GoodsWeight‘:1.0}]," +
                "‘Weight‘:1.0," +
                "‘Quantity‘:1," +
                "‘Volume‘:0.0," +
                "‘Remark‘:‘小心轻放‘," +
                "‘IsReturnPrintTemplate‘:1}";
        Map<String, String> params = new HashMap<String, String>();
        params.put("RequestData", urlEncoder(requestData, "UTF-8"));
        params.put("EBusinessID", EBusinessID);
        params.put("RequestType", "1007");
        String dataSign=encrypt(requestData, AppKey, "UTF-8");
        params.put("DataSign", urlEncoder(dataSign, "UTF-8"));
        params.put("DataType", "2");
 
        String result=sendPost(ReqURL, params); 
 
        //根据公司业务处理返回的信息......
 
        return result;
    }
    /**
     * MD5加密
     * @param str 内容       
     * @param charset 编码方式
     * @throws Exception 
     */
    @SuppressWarnings("unused")
    private String MD5(String str, String charset) throws Exception {
        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(str.getBytes(charset));
        byte[] result = md.digest();
        StringBuffer sb = new StringBuffer(32);
        for (int i = 0; i < result.length; i++) {
            int val = result[i] & 0xff;
            if (val <= 0xf) {
                sb.append("0");
            }
            sb.append(Integer.toHexString(val));
        }
        return sb.toString().toLowerCase();
    }
 
    /**
     * base64编码
     * @param str 内容       
     * @param charset 编码方式
     * @throws UnsupportedEncodingException 
     */
    private String base64(String str, String charset) throws UnsupportedEncodingException{
        String encoded = Base64.encode(str.getBytes(charset));
        return encoded;    
    }   
 
    @SuppressWarnings("unused")
    private String urlEncoder(String str, String charset) throws UnsupportedEncodingException{
        String result = URLEncoder.encode(str, charset);
        return result;
    }
 
    /**
     * 电商Sign签名生成
     * @param content 内容   
     * @param keyValue Appkey  
     * @param charset 编码方式
     * @throws UnsupportedEncodingException ,Exception
     * @return DataSign签名
     */
    @SuppressWarnings("unused")
    private String encrypt (String content, String keyValue, String charset) throws UnsupportedEncodingException, Exception
    {
        if (keyValue != null)
        {
            return base64(MD5(content + keyValue, charset), charset);
        }
        return base64(MD5(content, charset), charset);
    }
 
     /**
     * 向指定 URL 发送POST方法的请求     
     * @param url 发送请求的 URL    
     * @param params 请求的参数集合     
     * @return 远程资源的响应结果
     */
    @SuppressWarnings("unused")
    private String sendPost(String url, Map<String, String> params) {
        OutputStreamWriter out = null;
        BufferedReader in = null;        
        StringBuilder result = new StringBuilder(); 
        try {
            URL realUrl = new URL(url);
            HttpURLConnection conn =(HttpURLConnection) realUrl.openConnection();
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // POST方法
            conn.setRequestMethod("POST");
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            conn.connect();
            // 获取URLConnection对象对应的输出流
            out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
            // 发送请求参数            
            if (params != null) {
                  StringBuilder param = new StringBuilder(); 
                  for (Map.Entry<String, String> entry : params.entrySet()) {
                      if(param.length()>0){
                          param.append("&");
                      }               
                      param.append(entry.getKey());
                      param.append("=");
                      param.append(entry.getValue());                     
                      System.out.println(entry.getKey()+":"+entry.getValue());
                  }
                  System.out.println("param:"+param.toString());
                  out.write(param.toString());
            }
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream(), "UTF-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
        } catch (Exception e) {            
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result.toString();
    }
}

快递查询

import java.io.BufferedReader;
import java.io.IOException; 
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import java.security.MessageDigest; 
 
public class KdniaoSubscribeAPI {
 
    //DEMO
    public static void main(String[] args) {
        KdniaoSubscribeAPI api = new KdniaoSubscribeAPI();
        try {
            String result = api.orderTracesSubByJson();
            System.out.print(result);
 
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    //电商ID
    private String EBusinessID="请申请http://www.kdniao.com/ServiceApply.aspx";
    //电商加密私钥，注意保管，不要泄漏
    private String AppKey="请申请http://www.kdniao.com/ServiceApply.aspx";
    //测试请求url
    private String ReqURL = "http://testapi.kdniao.cc:8081/api/dist";
    //正式请求url
    //private String ReqURL = "http://api.kdniao.cc/api/dist";
 
    /**
     * Json方式  物流信息订阅
     * @throws Exception 
     */
    public String orderTracesSubByJson() throws Exception{
        String requestData="{‘OrderCode‘: ‘SF201608081055208281‘," +
                                "‘ShipperCode‘:‘SF‘," +
                                "‘LogisticCode‘:‘3100707578976‘," +
                                "‘PayType‘:1," +
                                "‘ExpType‘:1," +
                                "‘CustomerName‘:‘‘,"+
                                "‘CustomerPwd‘:‘‘," +
                                "‘MonthCode‘:‘‘," +
                                "‘IsNotice‘:0," +
                                "‘Cost‘:1.0," +
                                "‘OtherCost‘:1.0," +
                                "‘Sender‘:" +
                                "{" +
                                "‘Company‘:‘LV‘,‘Name‘:‘Taylor‘,‘Mobile‘:‘15018442396‘,‘ProvinceName‘:‘上海‘,‘CityName‘:‘上海‘,‘ExpAreaName‘:‘青浦区‘,‘Address‘:‘明珠路73号‘}," +
                                "‘Receiver‘:" +
                                "{" +
                                "‘Company‘:‘GCCUI‘,‘Name‘:‘Yann‘,‘Mobile‘:‘15018442396‘,‘ProvinceName‘:‘北京‘,‘CityName‘:‘北京‘,‘ExpAreaName‘:‘朝阳区‘,‘Address‘:‘三里屯街道雅秀大厦‘}," +
                                "‘Commodity‘:" +
                                "[{" +
                                "‘GoodsName‘:‘鞋子‘,‘Goodsquantity‘:1,‘GoodsWeight‘:1.0}]," +
                                "‘Weight‘:1.0," +
                                "‘Quantity‘:1," +
                                "‘Volume‘:0.0," +
                                "‘Remark‘:‘小心轻放‘}";
 
        Map<String, String> params = new HashMap<String, String>();
        params.put("RequestData", urlEncoder(requestData, "UTF-8"));
        params.put("EBusinessID", EBusinessID);
        params.put("RequestType", "1008");
        String dataSign=encrypt(requestData, AppKey, "UTF-8");
        params.put("DataSign", urlEncoder(dataSign, "UTF-8"));
        params.put("DataType", "2");
 
        String result=sendPost(ReqURL, params); 
 
        //根据公司业务处理返回的信息......
 
        return result;
    }
 
    /**
     * MD5加密
     * @param str 内容       
     * @param charset 编码方式
     * @throws Exception 
     */
    @SuppressWarnings("unused")
    private String MD5(String str, String charset) throws Exception {
        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(str.getBytes(charset));
        byte[] result = md.digest();
        StringBuffer sb = new StringBuffer(32);
        for (int i = 0; i < result.length; i++) {
            int val = result[i] & 0xff;
            if (val <= 0xf) {
                sb.append("0");
            }
            sb.append(Integer.toHexString(val));
        }
        return sb.toString().toLowerCase();
    }
 
    /**
     * base64编码
     * @param str 内容       
     * @param charset 编码方式
     * @throws UnsupportedEncodingException 
     */
    private String base64(String str, String charset) throws UnsupportedEncodingException{
        String encoded = base64Encode(str.getBytes(charset));
        return encoded;    
    }   
 
    @SuppressWarnings("unused")
    private String urlEncoder(String str, String charset) throws UnsupportedEncodingException{
        String result = URLEncoder.encode(str, charset);
        return result;
    }
 
    /**
     * 电商Sign签名生成
     * @param content 内容   
     * @param keyValue Appkey  
     * @param charset 编码方式
     * @throws UnsupportedEncodingException ,Exception
     * @return DataSign签名
     */
    @SuppressWarnings("unused")
    private String encrypt (String content, String keyValue, String charset) throws UnsupportedEncodingException, Exception
    {
        if (keyValue != null)
        {
            return base64(MD5(content + keyValue, charset), charset);
        }
        return base64(MD5(content, charset), charset);
    }
 
     /**
     * 向指定 URL 发送POST方法的请求     
     * @param url 发送请求的 URL    
     * @param params 请求的参数集合     
     * @return 远程资源的响应结果
     */
    @SuppressWarnings("unused")
    private String sendPost(String url, Map<String, String> params) {
        OutputStreamWriter out = null;
        BufferedReader in = null;        
        StringBuilder result = new StringBuilder(); 
        try {
            URL realUrl = new URL(url);
            HttpURLConnection conn =(HttpURLConnection) realUrl.openConnection();
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // POST方法
            conn.setRequestMethod("POST");
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            conn.connect();
            // 获取URLConnection对象对应的输出流
            out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
            // 发送请求参数            
            if (params != null) {
                  StringBuilder param = new StringBuilder(); 
                  for (Map.Entry<String, String> entry : params.entrySet()) {
                      if(param.length()>0){
                          param.append("&");
                      }               
                      param.append(entry.getKey());
                      param.append("=");
                      param.append(entry.getValue());                     
                      System.out.println(entry.getKey()+":"+entry.getValue());
                  }
                  System.out.println("param:"+param.toString());
                  out.write(param.toString());
            }
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream(), "UTF-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
        } catch (Exception e) {            
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result.toString();
    }
 
    private static char[] base64EncodeChars = new char[] { 
            ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘, ‘G‘, ‘H‘, 
            ‘I‘, ‘J‘, ‘K‘, ‘L‘, ‘M‘, ‘N‘, ‘O‘, ‘P‘, 
            ‘Q‘, ‘R‘, ‘S‘, ‘T‘, ‘U‘, ‘V‘, ‘W‘, ‘X‘, 
            ‘Y‘, ‘Z‘, ‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, 
            ‘g‘, ‘h‘, ‘i‘, ‘j‘, ‘k‘, ‘l‘, ‘m‘, ‘n‘, 
            ‘o‘, ‘p‘, ‘q‘, ‘r‘, ‘s‘, ‘t‘, ‘u‘, ‘v‘, 
            ‘w‘, ‘x‘, ‘y‘, ‘z‘, ‘0‘, ‘1‘, ‘2‘, ‘3‘, 
            ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘+‘, ‘/‘ }; 
 
    public static String base64Encode(byte[] data) { 
        StringBuffer sb = new StringBuffer(); 
        int len = data.length; 
        int i = 0; 
        int b1, b2, b3; 
        while (i < len) { 
            b1 = data[i++] & 0xff; 
            if (i == len) 
            { 
                sb.append(base64EncodeChars[b1 >>> 2]); 
                sb.append(base64EncodeChars[(b1 & 0x3) << 4]); 
                sb.append("=="); 
                break; 
            } 
            b2 = data[i++] & 0xff; 
            if (i == len) 
            { 
                sb.append(base64EncodeChars[b1 >>> 2]); 
                sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]); 
                sb.append(base64EncodeChars[(b2 & 0x0f) << 2]); 
                sb.append("="); 
                break; 
            } 
            b3 = data[i++] & 0xff; 
            sb.append(base64EncodeChars[b1 >>> 2]); 
            sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]); 
            sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]); 
            sb.append(base64EncodeChars[b3 & 0x3f]); 
        } 
        return sb.toString(); 
    }
}